Temperature-compensated regulator



Painted Mig 15, 1922,

APPLICATIGN HLED SEPT. i6, 1920,

PATENT FFI'QE.

JOHN H. HUNT, OF DAYTN, OHIO. ASSIGNGR TO THE DAYTN ENGINEERING LABO-RATREES COMPANY,

GF DAYTON. OHO. A CORPORATN F OHIG.

TEMPERATURE-CGMPENSATED REGULATGR.

...mim-mum.,

Application lcd September' le, i929,

To m'/ /i'liom /l' muymuco/'11.

lic il linown that l. rloue.' ll. llin'r` zi citizen ol the llniied#haies ol' America. residing4 al' lai'ion. count \y ol lilonln'onier'r.o and letale ol' yihio. have invented certain neu' and usefulimprovements in Tempcia ture-lonipensalcd lleg'ulaiore, olI which thefollowing' is a lull, clear. and exact description.

'lhis invention relates to eicelromagrnetic regulating` devices and hasamong' its objects the compensation l'or lhc increase in resistance inthe windings ol' he regulator due io increase in temperature.

Other and l'urther objects oll iui'ention wiil be apparen'lV froml'ollowinir descripiioin reference being4 l to the accompanting'.lraxuing;2 wherein a pre i'erred embodiment ol' the presentini'enlionis clearly shown,

in ilse drawing1t- Fig. l is a plan View oi' a rconlaioi enibodyingr theinvention; and

Fic'. 2 is a sectional View taken on the line 2 2 ol Fig'. i.

llejierriugg to the drawing., a traine provided with a base poriion 2iand an up* right portion 22 which is bilurcnled at its upper end toproride ears 23S and 2l. rod 25 pin through ears ii and ind' snpports annature 2li whi' Ai carries; at one cnil a. cont., contact 2S.

the present the lim ijontacl'. 2"? is mounted upon a.

bracket. 555i which is secured to the traine but insulated therclroin byblack 30. A.

'springg '-i is connected ai; one end to a "hraciiet 32 secured upon:traine 20. and at the other end is attained to the ari'natnre 26.Spring' 3l' normr ll -inaintnins contacts 2f' and 2li' in engagenie(lenti ts 2T and 2S are connected in the regulating circuit. rThisregulating' circuit may be any oll the Well-known `forms. Forexan'ipli-n contacts 22T and 2S muy be coin nected in :i short circuitaround if resistance conneeted in series with n held circuit of adynamo.

The base portion 2l ot {rain-e Si() Supports a magnet eore fi@comprising a mein p0rtion 41, a pole tip portion end temper tureresponsive portion Seemed at one end to the main 'portion fil anni atthe other tothe pole tip portion 42.' The magnet Windinw or windingswhich surround the Speccaton of Letters Patent.

to be understooil 'that other forms t QT eooporatii'ig with a lixedlaicnieii Ang'. lo, 19.32. sci-.iai no. 410,801.

,able material ha ring a low coellicient of expnnsion. yl`his materialis preferably inval steel. The temperature responsive element -lfl isconstructed of material haring. a relalively high coeflicient olexpansion, 3preferably aluminum. rilhe external diameter ol the mainportion il is reduced at its upper end as indicated by nun'ieral 4G, soas to be encircled by the cup shaped pole tip portion l2 haring' anexternal diameter suhstaniall)v equal to the largest external diameterot the main core portion 4l.

lt is apparent that as the temperature surroiunlinnA the regulatorincreases. the rod L3 will expand faster than the main core portion il.thereby increasing' the overall length oi" the magnet core #l0 anddecreasing the air gap het-een the magnet core and 'the armature 2li.'lhis derrense of the air gap will compensate for the decrease iniuan'netinnotive torce oi the magnet windings lo which results from theincrease in resistance then-iol' due to increase in temperature.

ldfhile the shown and torni of torni of' mechanism herein describedconstitutes a prelerreiil embodiment ol' the invention. it is might beadopted, all coming' within the scope o'le the elaime` which `follow.

what l' claim is as follows:

l. ln a regulator, the cinnbination with :in armature tor controlling acircuiti of a lrzimo supporting' said armature; an elcetronian'nei'including a controlling' vwinding` and a magnet core member, and tempera.ture responsive means for 'aryinggj the position of the core withrespectto the frame whereby to vary the air rap between the magnet coreand armature.

2. ln a regulator, the combination with an'arimiture for controlling acircuit; ol an elc-\cti 'i ii1ag'11et inclucliimr a controlling' Wind`ine'. and a magnet core including a main portion and a separate pole tipportion and temperature responsive. means for varyingr the position ofthe pole tip with respect to the main portion7 whereby to vary the airgap between the magnet core and armature.

3. ln a regulator, the combination with :in armature for controlling acircuit; of an enti 'the other end` eleetroinegnet including' zicontrolling Wincling, and o magnet Core including a tubular moinportion, e eup-Sliziped pole tip portion encircling one end of Said mainportion, and e temperature responsive rod having e greater coefficientof expansion than the moin portion, located Within said main portion andhaving one vend secured theretoy Secured to 'said rpole tipl portion. iy

et. iin a regulator) the; combination with an armature for oontroliing ncircuit; of' en( eleotromaignet ineiudi'ng o, controlling Winding7 and amagnet Core including a tubular mein portion of rnagnetieable materielhaving :L relatively low coelioient of expansion, a onpeheped pole tipPortion encircling one end of Said mitin portion, and an aluminum roellocated Within said mein portion and mamas having one end securedthereto and the other end secured to said pole tip portion.

5. ln e regulator, the combination with an `armature for controlling` :icircuit; ,of an eleotrornagnet including :L controlling Winding, and emagnet core including :1 tubular main portion of invur steel`r :i oup-Sliaped pole tip portion encircling one enfl of said main portion, undan aluminum rod. located Within said main portion und han ing oneendseeured thereto and the other end secured to said pole tip portion.

ln testimony Wliereol' l hereto :il'lix my (signature.

JGHN H. HUNT.

Witnesses llVAL'rnR W. RIEDEL, CHAUNCEY D. MILLER

